package practice.w910;

public class StringDemo {

    public static void main(String[] args) {
        String s1 = "123abc";
        String s2 = "123abc";
        String s3 = "123abc";
        System.out.println(s1==s2);
        System.out.println(s1==s3);
        String s4 = new String("123abc");
        System.out.println(s4==s1);
        s1 = s1+"!";
        System.out.println(s1==s2);
        String s = "123";
        String s5 = s+"abc";
        System.out.println(s5==s2);
        String s6 = "123"+"abc";
        System.out.println(s6==s2);
        String s7 = "123abc";
        String s8 = new String("123abc");
        System.out.println(s7==s8);
        System.out.println(s7.equals(s8));


//        String s1 = "123abc";
//        String s2 = "123abc";
//        String s3 = "123abc";
//        System.out.println(s1==s2);
//        System.out.println(s1==s3);
//        String s4 = new String("123abc");
//        System.out.println(s4==s1);
//        s1 = s1+"!";
//        System.out.println(s1==s2);
//        String s = "123";
//        String s5 = s+"abc";
//        System.out.println(s5==s2);
//        String s6 = "123"+"abc";
//        System.out.println(s6==s2);
//        String s7 = "123abc";
//        String s8 = new String("123abc");
//        System.out.println(s7==s8);
//        System.out.println(s7.equals(s8));
    }
}